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[tex]\vec{v}=\frac{\mathrm{d} \vec{r}}{\mathrm{d} t}[/tex]

so:

[tex]\\ \vec{v} = \frac{d\vec{r}}{dt} \\ \\ \vec{v}\;dt = d\vec{r} \\ \\ dt = \frac{d\vec{r}}{\vec{v}} \\ \\ \int dt = \int \frac{d\vec{r}}{\vec{v}} \\ \\ t = \int \frac{d\vec{r}}{\vec{v}}[/tex]

Is true?

Solving the equation for time t, is need divide the position vector r by velocicty vector v... But I don't know do division between vectors...

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# Reciprocal of a vector

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